a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
a signal for attracting attention
a device for showing the operating condition of some system
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
双语例句
Health indicators are the building blocks of the health monitor. 健康状况指示器是健康监视器的基础。
The operator is alerted to this situation by blinking front-panel indicators. 面板上的指示器将出现闪光，对操作者发出出现这种情况的警告。
